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GB/T 20299.3-2024 Chinese PDF (GB/T20299.3-2024) GB 44172-2024 4-2025_Chinese: Instruments for stage measurement

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4-2025_Chinese: Instruments for stage measurement - Part 4: Ultrasonic stage recorder (Chinese: 水位测量仪器 第4部分：超声波水位计)

1-2024_Chinese: Information technology - Security techniques - Non-repudiation - Part 1: General (Chinese: 信息技术 安全技术 抗抵赖 第1部分：概述)

English versions: YY/T 1284-2024

English versions: GB/T 39141

GB/T 20299.3-2024 Chinese PDF (GB/T20299.3-2024) GB 44172-2024 4-2025_Chinese: Instruments for stage measurementGB T 20299. 3 2024_Chinese: Digital technique application of building and residence community Part 3: Property management (Chinese: 3) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 20299. 3 2024

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